Partie 4: conduire

Modification de ESP-IDF

// Initialize SPI bus
esp_err_t ret = spi_bus_initialize((spi_host_device_t)slot, &buscfg,
    slot_config->dma_channel);
if (ret != ESP_OK) {
    ESP_LOGD(TAG, "spi_bus_initialize failed with rc=0x%x", ret);
    //return ret;
}

Initialisation

8.3, . , fopen . make menuconfig, , 8.3.

FILE* spriteFile = fopen("/sdcard/key", "r");
assert(spriteFile);

uint16_t* sprite = (uint16_t*)malloc(64 * 64 * sizeof(uint16_t));

for (int i = 0; i < 64; ++i)
{
	for (int j = 0; j < 64; ++j)
	{
		fread(sprite, sizeof(uint16_t), 64 * 64, spriteFile);
	}
}

fclose(spriteFile);

int spriteRow = 0;
int spriteCol = 0;

for (int row = y; row < y + 64; ++row)
{
	spriteCol = 0;

	for (int col = x; col < x + 64; ++col)
	{
		uint16_t pixelColor = sprite[64 * spriteRow + spriteCol];

		if (pixelColor != 0)
		{
			gFramebuffer[row * LCD_WIDTH + col] = color;
		}

		++spriteCol;
	}

	++spriteRow;
}

if (input.menu)
{
	const char* snapFilename = "/sdcard/framebuf";

	ESP_LOGI(LOG_TAG, "Writing snapshot to %s", snapFilename);

	FILE* snapFile = fopen(snapFilename, "wb");
	assert(snapFile);

		fwrite(gFramebuffer, sizeof(gFramebuffer[0]), LCD_WIDTH * LCD_HEIGHT, snapFile);
	}

	fclose(snapFile);
}

convert -depth 16 -size 320x240+0 -endian msb rgb565:FRAMEBUF snap.png

Références

• Schéma Odroid Go
• Documentation ESP-IDF: SDMMC

Partie 5: batterie

Schème

LED d'état

Initialisation

static const adc1_channel_t BATTERY_READ_PIN = ADC1_GPIO36_CHANNEL;
static const gpio_num_t BATTERY_LED_PIN = GPIO_NUM_2;

static esp_adc_cal_characteristics_t gCharacteristics;

void Odroid_InitializeBatteryReader()
{
	// Configure LED
	{
		gpio_config_t gpioConfig = {};

		gpioConfig.mode = GPIO_MODE_OUTPUT;
		gpioConfig.pin_bit_mask = 1ULL << BATTERY_LED_PIN;

		ESP_ERROR_CHECK(gpio_config(&gpioConfig));
	}

	// Configure ADC
	{
		adc1_config_width(ADC_WIDTH_BIT_12);
    	adc1_config_channel_atten(BATTERY_READ_PIN, ADC_ATTEN_DB_11);
    	adc1_config_channel_atten(BATTERY_READ_PIN, ADC_ATTEN_DB_11);

    	esp_adc_cal_value_t type = esp_adc_cal_characterize(
    		ADC_UNIT_1, ADC_ATTEN_DB_11, ADC_WIDTH_BIT_12, 1100, &gCharacteristics);

    	assert(type == ESP_ADC_CAL_VAL_EFUSE_VREF);
    }

	ESP_LOGI(LOG_TAG, "Battery reader initialized");
}

Lecture de la batterie

uint32_t Odroid_ReadBatteryLevel(void)
{
	const int SAMPLE_COUNT = 20;


	uint32_t raw = 0;

	for (int sampleIndex = 0; sampleIndex < SAMPLE_COUNT; ++sampleIndex)
	{
		raw += adc1_get_raw(BATTERY_READ_PIN);
	}

	raw /= SAMPLE_COUNT;


	uint32_t voltage = 2 * esp_adc_cal_raw_to_voltage(raw, &gCharacteristics);

	return voltage;
}

Réglage LED

void Odroid_EnableBatteryLight(void)
{
	gpio_set_level(BATTERY_LED_PIN, 1);
}

void Odroid_DisableBatteryLight(void)
{
	gpio_set_level(BATTERY_LED_PIN, 0);
}

Démo

uint32_t batteryLevel = Odroid_ReadBatteryLevel();

if (batteryLevel < 3600)
{
	Odroid_EnableBatteryLight();
}
else
{
	Odroid_DisableBatteryLight();
}

Références

• Schéma Odroid Go
• Documentation ESP-IDF: ADC
• Caractéristiques de la batterie

Partie 6: son

Bases du son numérique

Record

Jouer

Taux d'échantillonnage

Peu profond

Fichiers WAV

I2S

1. Nous transférons les données audio vers le pilote I2S
2. Le pilote I2S envoie les données audio au DAC interne 8 bits
3. Le DAC interne émet un signal analogique
4. Le signal analogique est transmis à l'amplificateur sonore

Multitâche

Initialisation

static const gpio_num_t AUDIO_AMP_SD_PIN = GPIO_NUM_25;

static QueueHandle_t gQueue;

static void PlayTask(void *arg)
{
	for(;;)
	{
		QueueData data;

		if (xQueueReceive(gQueue, &data, 10))
		{
			size_t bytesWritten;
			i2s_write(I2S_NUM_0, data.buffer, data.length, &bytesWritten, portMAX_DELAY);
			i2s_zero_dma_buffer(I2S_NUM_0);
		}

		vTaskDelay(1 / portTICK_PERIOD_MS);
	}
}

void Odroid_InitializeAudio(void)
{
	// Configure the amplifier shutdown signal
	{
		gpio_config_t gpioConfig = {};

		gpioConfig.mode = GPIO_MODE_OUTPUT;
		gpioConfig.pin_bit_mask = 1ULL << AUDIO_AMP_SD_PIN;

		ESP_ERROR_CHECK(gpio_config(&gpioConfig));

		gpio_set_level(AUDIO_AMP_SD_PIN, 1);
	}

	// Configure the I2S driver
	{
		i2s_config_t i2sConfig= {};

		i2sConfig.mode = I2S_MODE_MASTER | I2S_MODE_TX | I2S_MODE_DAC_BUILT_IN;
		i2sConfig.sample_rate = 5012;
		i2sConfig.bits_per_sample = I2S_BITS_PER_SAMPLE_16BIT;
		i2sConfig.communication_format = I2S_COMM_FORMAT_I2S_MSB;
		i2sConfig.channel_format = I2S_CHANNEL_FMT_ONLY_LEFT;
		i2sConfig.dma_buf_count = 8;
		i2sConfig.dma_buf_len = 64;

		ESP_ERROR_CHECK(i2s_driver_install(I2S_NUM_0, &i2sConfig, 0, NULL));
		ESP_ERROR_CHECK(i2s_set_dac_mode(I2S_DAC_CHANNEL_LEFT_EN));
	}

	// Create task for playing sounds so that our main task isn't blocked
	{
		gQueue = xQueueCreate(1, sizeof(QueueData));
		assert(gQueue);

		BaseType_t result = xTaskCreatePinnedToCore(&PlayTask, "I2S Task", 1024, NULL, 5, NULL, 1);
		assert(result == pdPASS);
	}
}

• mode
  • nous définissons le pilote comme un maître (contrôlant le bus), un émetteur (car nous transférons des données aux destinataires), et le configurons pour utiliser le DAC 8 bits intégré (car la carte Odroid Go n'a pas de DAC externe).
• taux d'échantillonnage
  • 5012, , , . , , . -, 2500 .
• bits_per_sample
  • , ESP32 8-, I2S , 16 , 8 .
• communication_format
  • , , - , 8- 16- .
• channel_format
  • GPIO, IN+ — IO26, «» I2S. , I2S , IO25, , .
• dma_buf_count dma_buf_len
  • DMA- ( ) , , , IDF. , .

Jouer son

void Odroid_PlayAudio(uint16_t* buffer, size_t length)
{
	QueueData data = {};

	data.buffer = buffer;
	data.length = length;

	xQueueSendToBack(gQueue, &data, portMAX_DELAY);
}

Démo

// Load sound effect
uint16_t* soundBuffer;
int soundEffectLength = 1441;
{
	FILE* soundFile = fopen("/sdcard/jump", "r");
	assert(soundFile);

	uint8_t* soundEffect = malloc(soundEffectLength);
	assert(soundEffect);

	soundBuffer = malloc(soundEffectLength*2);
	assert(soundBuffer);

	fread(soundEffect, soundEffectLength, 1, soundFile);

    for (int i = 0; i < soundEffectLength; ++i)
    {
        // 16 bits required but only MSB is actually sent to the DAC
        soundBuffer[i] = (soundEffect[i] << 8u);
    }
}

int lastState = 0;

for (;;)
{
	[...]

	int thisState = input.volume;

	if ((thisState == 1) && (thisState != lastState))
	{
		Odroid_PlayAudio(soundBuffer, soundEffectLength*2);
	}

	lastState = thisState;

	[...]
}

La source

Références

• Schéma Odroid Go
• Fiche technique de l'amplificateur audio
• Documentation ESP-IDF: DAC
• Documentation ESP-IDF: I2S
• Format de fichier WAVE
• Vidéo: Explication de la profondeur de bits
• Vidéo: Explication du taux d'échantillonnage